Twitter (TWTR)-The microblogging site reported fourth quarter profit of two cents per share, compared to expectations of a two cent loss. Twitter's current quarter revenue projections are also above Street estimates, but investors appear far more concerned about the slowdown in user growth during the quarter to its lowest ever.

Cummins (CMI)-The engine maker earned $2.32 per share for the fourth quarter, beating estimates of $1.98. Revenue was also above consensus, helped by strong results in North America, China, and Brazil.

Dunkin' Brands (DNKN)-The coffee chain earned 43 cents per share, excluding certain items, for the fourth quarter, beating estimates by three cents. Revenue was also above estimates, with Dunkin' also raising its quarterly dividend by 21 percent to 23 cents per share.

Aetna (AET)-The insurance company fell two cents short of estimates with fourth quarter profit of $1.34 per share, excluding certain items. Aetna did say it will acquire 110,000 new Medicare customers during the current quarter.

Costco (COST)-The warehouse retailer reported a four percent increase in stores open at least a year in January, above the 3.3 percent consensus analyst estimate.

Sony -The electronics giant is cutting 5,000 jobs and splitting off its personal computer and TV operations, cutting nearly a billion dollars per year from its fixed costs. It's also predicting loss for the fiscal year ending in March, compared to analyst forecasts of a profit.

Google (GOOG)-A trial involving Google and patent owner Intellectual Ventures ended in a mistrial, due to the failure of the deliberating jury to come to an agreement. The case involved patent claims against Google's Motorola Mobility unit.

Green Mountain Coffee Roasters (GMCR)-The maker of the popular Keurig single-cup brewing system has entered a strategic partnership with Coca-Cola (KO), which involves Coke buying a 10 percent stake in Green Mountain for $1.25 billion.

Walt Disney (DIS)-The entertainment conglomerate reported a fiscal first quarter profit of $1.04 per share, excluding certain items, 12 cents above estimates, with revenue also beating consensus. Disney's results were aided by its results at ESPN as well as the success of the hit movie "Frozen".

Yelp (YELP)-Yelp lost three cents per share for the fourth quarter, one cent more than expected, but revenue did beat analyst forecasts. Investors were also encouraged by the growth in new users.

Pandora (NYSE:P)-The online radio site earned 11 cents per share for the fourth quarter, four cents above estimates, but also predicted a wider than expected loss for the current quarter. Pandora's results are being hit by costs to acquire more listeners.

Allstate (ALL)-The insurer reported fourth quarter profit of $1.70 per share, 32 cents above estimates, and its CEO said the company hopes to growth its share of the home and auto insurance markets without significant price increases.

Shutterfly (SFLY)-Shutterfly earned $1.20 per share, excluding certain items, for the fourth quarter, 13 cents above estimates, with revenue above consensus as well. But the online photo sharing service also forecast a current quarter loss of 86 to 92 cents per share, compared to estimates of a 42 cent loss.